bathroom flooring tile over wood floor

[Tarek Soliman]

Hi BP 

I am trying to install bathroom floor tile, it has very old sticky tiles 2 layers on the top of ecah other, and the bottom is the original wood floor. 

what would be the best way to install the tile?

should I use 1/4' hardibacker, which mostly after installing the tile would be higher than the current original floor. 

keep in mind I have the bathroom cabinet and the bathtub already there. 

what should  cover the bathroom original wood floor properly in order to install the tile.  

Thank you 

[David S.]

I have used the 1/2 inch Hardiebacker Cement Backerboard and have not had any grout cracking or tiles coming up.  Yes, the level is higher, but this step is necessary for a proper installation.

Normally, one would tile up to the cabinet and then install shoeboard trim.  Also, tiling would go to the bathtub.  I have seen tiling underneath the cabinet a few times, but that was when a new cabinet was installed during a complete renovation.

Schluter has a flat underlayment that I seen on Holmes on Holmes and is sold at Home Depot.  However, I have never used that product. and can't speak to how effective it is.